Managed to beat it this time! Ammo feels a lot more generous, and I was able to pick up most of the weapons in this version. Probably because I didn't miss out on the elephant level this time, so I went into the boss with a lot more resources. I think ammo might be a bit too generous right now, since I never really worried about it unlike my previous attempt, although I found a lot more secrets and had more weapons to use this time.
Elephant: Only the projectile attacks seem unfair. It's hard to see it in the dark, and it tracks in a weird way that I don't really understand. Unless I managed to get it stuck between some trees or something to block it, it would always hit me a few times.
Chieftain: Overall much better, but his jump slam attack seems to trigger even when he lands on objects that aren't the ground, so the hitbox ends up being higher than I would expect, and this killed me a few times.